Coin bank



FIG. 1 is a rear, top and left side perspective view of a coin bank showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a bottom plan view;

FIG. 4 is a left side elevational view, the right side elevational view being a mirror image; and

FIG. 5 is a top plan view. 

The ornamental design for a coin bank, as shown and described. 